[dirkbuddy]

Thanks for the replies folks, I'm going to tackle removing the cone as per Radioroslyn suggestion when I have time here.  But getting back to my original question and the first post with my attached drawn up schematic,  IF i had to replace the speaker, say with a PM speaker, Would I have to A) Change the output transformer to one that will be able to drive a 6 ohm PM?  B) Replace the field coil with a 3.2 K resistor? If so what wattage?
C) Increase the 2nd Electro cap from 6uf to 12 uf?  D) Do I have to do anything with the filter choke?    am I on the right track here ?